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Connecting to the RS-232C Port at the Host
Section 4-1
S Connecting to a CVM1/CV series host link unit
CVM1/CV series backplane mounted type: CV500-LK201
A CVM1/CV series host link unit (CV500-LK201) has two connectors (commu-
nication ports 1 and 2). Either of these ports can be used for connection to an
NT31/NT31C by the RS-232C method. However, since the connectors at these
ports are of different types, a cable that matches the connector must be pre-
pared.
- Communication port 1
Communication port 1 is a 25-pin connector for RS-232C use only.
- Communication port 2
Communication port 2 is a 9-pin connector which allows selection of the
RS-232C or RS-422A method. When this port is used with the RS-232C meth-
od, the I/O port selector switch on the front of the unit must be set to “RS-232C”
(the upper position).
[CPU bus unit settings]
When connecting to a CVM1/CV series host link unit, set the following commu-
nication conditions for the CPU bus unit settings.
Item Setting at Host
Communications speed Set the same speed as set at the NT31/NT31C
(*1)
Transfer code ASCII, 7 data bits, 2 stop bits
Parity Even
1-to-1, 1-to-N 1-to-N
(*2)
Instruction level Level 1, 2, 3
*1 Set the host link communications speed at 9600 bps or 19200 bps with the
memory switch at the NT31/NT31C. For details, refer to “Setting the Host Link
Method” (page176).
*2 The 1-to-N setting enables BCC (Block Check Character). It is not actually
possible to connect more than one NT31/NT31C in a single host link.
Set the CPU bus unit settings directly from a peripheral tool (e.g. SYSMAC sup-
port software).
For details on the CPU bus unit settings, refer to the SYSMAC CVM1/CV series
Host Link Unit User’s Manual (W205-E1-j).
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